[1.8.x] Sorted imports with isort; refs #23860.

Backport of 0ed7d15563 from master

tests/admin_widgets/tests.py

@@ -1,17 +1,12 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from datetime import datetime, timedelta
 import gettext
-from importlib import import_module
 import os
+from datetime import datetime, timedelta
+from importlib import import_module
 from unittest import TestCase, skipIf
 
-try:
-    import pytz
-except ImportError:
-    pytz = None
-
 from django import forms
 from django.conf import settings
 from django.contrib import admin
@@ -21,14 +16,17 @@ from django.core.files.storage import default_storage
 from django.core.files.uploadedfile import SimpleUploadedFile
 from django.core.urlresolvers import reverse
 from django.db.models import CharField, DateField
-from django.test import TestCase as DjangoTestCase
-from django.test import override_settings
-from django.utils import six
-from django.utils import translation
+from django.test import TestCase as DjangoTestCase, override_settings
+from django.utils import six, translation
 
 from . import models
 from .widgetadmin import site as widget_admin_site
 
+try:
+    import pytz
+except ImportError:
+    pytz = None
+
 
 admin_static_prefix = lambda: {
     'ADMIN_STATIC_PREFIX': "%sadmin/" % settings.STATIC_URL,